Answer: A) 4.2 x 10^20
Explanation:
All of the answers are pretty much the same so it comes down to significant digits.
You always go with the <u>least number of significant digits</u> that you have been given.
So 0.24g only has 2 so our answer will only have 2 significant digits.
If you want to know how to do the math here it is:
Avogadro's Number: 6.022 x 10^23
This number also equals 1 mole.
1 mole of sucrose is equal to 342.3g.
So the equation is set up like this:
0.24g x 1 mol / 342.3 g x 6.022 x 10^23 / 1 mol = 4.2 x 10^20 molecules.
